Stalls at stop when at peak temp

My 1998 cavalier Z24 manual trans. When the temp. guage is at normal operating temp, at half way point, my car will stall when I put it in first gear and attempt to accelerate. Also I noticed, when I push the clutch in to switch gears the rpms increase about 500 then drop down to about 1100. When I am approaching a stop sign or stop light and put the car in nuetral as I am slowing down the rpms increase again then it idles down and dies. I am thinking O2 sensor but there are no codes. The car runs great when it is cold. What could be the problem?

My problem wasn't the O2 sensor. Finally threw a code...106 then 107 and 108...Map Sensor and circuit. Checked the wires and found no issue. Then tried to clean the nipple where the hose from the MAP sensor went into the exhaust below the throttle body and I couldn't get a pipe cleaner in there so I sprayed some wal-mart break cleaner in it and continued to attempt a breakthrough and sure enough it cleaned out and now no issue at all. Yay me!!!

My problem wasn't the O2 sensor. Finally threw a code...106 then 107 and 108...Map Sensor and circuit. Checked the wires and found no issue. Then tried to clean the nipple where the hose from the MAP sensor went into the exhaust below the throttle body and I couldn't get a pipe cleaner in there so I sprayed some wal-mart break cleaner in it and continued to attempt a breakthrough and sure enough it cleaned out and now no issue at all. Yay me!!!

My problem wasn't the O2 sensor. Finally threw a code...106 then 107 and 108...Map Sensor and circuit. Checked the wires and found no issue. Then tried to clean the nipple where the hose from the MAP sensor went into the exhaust below the throttle body and I couldn't get a pipe cleaner in there so I sprayed some wal-mart break cleaner in it and continued to attempt a breakthrough and sure enough it cleaned out and now no issue at all. Yay me!!!

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Sure you can .. but prepare yourself for a whole lot of work with very little gain.. I would consider buying a different car.. If you want to go fast look at V8 5.0 mustangs 1989-1995 The 5.0 are really fast and easy to work on. and cheap. especially the 1994-1995 since they are ugly.The manual 5 speed trans are the way to go.

If it's an automatic, it could be the torque converter solenoid. Symptoms are stalling when coming to a stop after reaching speeds of 40mph and above. If it restarts immediately then stalls after putting in gear, that's what it is.

there are two coolant temp sensors on this car one controls the fans and one controls the temp guage in the car. one is located near the thermostat housing and the other is usually located in the block. the one near the thermostat housing usually controls the fans. also try to jumper the fan and make sure the fan is working.

This is a longshot, I recall a Pontiac Fiero that had a similar problem. It turned out to be the TCC ( torque converter clutch ). which is part of the transmission. The TCC engages when in high gear ( 4th gear in your case ) . It is supposed to DISENGAGE when stepping on the brakes and slowing down. If it doesnt disengage, what you are experiencing occurs. Does it do it all the time or only when car reaches operating temperature ?.

it take water to make the gage work . if it a head problem i would do a compression check it should be around 125 or 150 psi if a cyclinder do not read then there your problem with the head if not a head problem and compression look good and u did not run for a long time . then the head might be ok then i would change the water pump and it should be good